|Occupation||Disciplinary Committee President|
Sumiko has chin-lenght brown hair parted in the middle. She wears glasses which obscure her eyes, making it impossible to know their color. She is usually seen wearing her school uniform.
Sumiko has a strict and uptight personality, and takes her job as Disciplary very seriously, becoming alert whenever someone breaks the school's rules. Despite her attitude, it is hinted that she wants to be victimized by Shibaki's perversion.
Her family and Shibaki's family are old friends, and they've gone to the same school since childhood.
Troubles After Summoning RurumoEdit